Gulp error - webpack

Hi people, when i do the command gulp i have an error "Module build failed". Why does this happen?

Module build failed: SyntaxError: Unexpected token (83:0)
    at Parser.pp$4.raise (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:2221:15)
    at Parser.pp.unexpected (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:603:10)
    at Parser.pp$3.parseExprAtom (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1822:12)
    at Parser.parseExprAtom (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/dist/buble.umd.js:656:26)
    at Parser.pp$3.parseExprSubscripts (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1715:21)
    at Parser.pp$3.parseMaybeUnary (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1692:19)
    at Parser.pp$3.parseExprOps (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1637:21)
    at Parser.pp$3.parseMaybeConditional (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1620:21)
    at Parser.pp$3.parseMaybeAssign (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1597:21)
    at Parser.pp$3.parseExpression (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1573:21)]
  message: './resources/assets/js/app.js\nModule build failed: SyntaxError: Unexpected token (83:0)\n    at Parser.pp$4.raise (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:2221:15)\n    at Parser.pp.unexpected (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:603:10)\n    at Parser.pp$3.parseExprAtom (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1822:12)\n    at Parser.parseExprAtom (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/dist/buble.umd.js:656:26)\n    at Parser.pp$3.parseExprSubscripts (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1715:21)\n    at Parser.pp$3.parseMaybeUnary (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1692:19)\n    at Parser.pp$3.parseExprOps (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1637:21)\n    at Parser.pp$3.parseMaybeConditional (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1620:21)\n    at Parser.pp$3.parseMaybeAssign (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1597:21)\n    at Parser.pp$3.parseExpression (/Users/john/Projects/Arquivo/arquivo/node_modules/buble/node_modules/acorn/dist/acorn.js:1573:21)',
  showStack: false,
  showProperties: true,
  plugin: 'webpack-stream',
  __safety: { toString: [Function: bound ] } }

Thank's for helping me.